. The American journal of roentgenology, radium therapy and nuclear medicine . arythe radiological examination presents shad-ows of a character usually consideredcharacteristic of hvdatid disease, is the Editorials 757 diagnosis assured? By no means, for theremust be a differentiation between hydatidcyst shadows and the \arious other tumorsand diseases which may produce abnormalshadows in the thoracic most easily confounded diseases aremediastinal sarcoma, interlobar pleurisy,pulmonary gangrene, pleural elfusion, der-moid cyst, and pulmonary abscess. Pulmonary hydatid cysts u
. The American journal of roentgenology, radium therapy and nuclear medicine . arythe radiological examination presents shad-ows of a character usually consideredcharacteristic of hvdatid disease, is the Editorials 757 diagnosis assured? By no means, for theremust be a differentiation between hydatidcyst shadows and the \arious other tumorsand diseases which may produce abnormalshadows in the thoracic most easily confounded diseases aremediastinal sarcoma, interlobar pleurisy,pulmonary gangrene, pleural elfusion, der-moid cyst, and pulmonary abscess. Pulmonary hydatid cysts usually presentshadows highly characteristic of the dis- of the reaction of the surrounding tissues,resulting in pleural or pulmonary processeswhich mask the typical shadows. In themajority of cases there will remain somefree portion of the cyst not covered by thisobscuring process. In others, however, thesurrounding reaction materially compli-cates the diagnosis. In differentiating pulmonary hydatidcvst from the intrathoracic conditionsalready mentioned, the history and the. Fig. 5. A group of American visitors in Dr. Heusers laboratory, BuenosAires. Dr. Heuser in wliile gown, indicated by X. ease, and the diagnosis is usually simpleeither with the film or with the is especially true in dealing with cen-tral cysts giving uniform shadows of varia-ble size, rounded or oval, and with well-circumscribed borders surrounded byhealthy, cortical tissue. The translucencyof the surrounding lung tissue makes thetypical opaque shadow of the cyst standout characteristically. In the presence ofa shadow giving such characteristics, thediagnosis offers no doubt; but it fre-quently occurs, especially in some of thosecases where cysts have undergone purulentinfection, that the cyst shadows do notpresent all these characteristics on account clinical signs play a very important cyst and pleuropulmonary hema-tocele are, in the Lanari opinion, notdistinguishable roentgenolog
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